Pipe-joint.



R. R. BUST. PIPE JOINT.

APPLICATION FILED DEC. 6, 1910.

Patented Aug. 27, 1912.

A X A STATES PATENT oF cE.

nonnnrn. nusr, or NEW YORK, N. Y.

' urn-30mm.

Specification of Letters Patent.

Application mes December a, 1910. Serial No. 595,876.

Patented Aug. 27-, 1912.

To all whom it mag concern Be it known that I, ROBERT citizen of the United States of America, re

ordinarily subjected.

siding in the city, county, and State of New York, have invented certain new and useful Improvements in Pipe-Joints, of which the following is a specification. v

M invention'relates to p1pe joints and.

has or its object the provision of simple and efficient means to preventthe opening of the quently a certain amount of flexion at the joints due to the settling of the .ground andto expansion and contraction resulting from the varyin temperature conditions. Therefore a per ectly rigid joint cannot safely be made and a certain amount of play must always be allowed for at the joints. The latter are also subjected to severe strains by the heavy hydraulic pressure of the water flowing therethrough and suitable means must be rovided tomeet this strain, and to prevent t e joint from opening.

In water mains as now generally constructed, it is customary to rely upon the end thrust of the adjoining pipes to maintain the joint between the sametight. In some cases straps .are bolted or riveted around the joint to strengthen the same, but straps of this character are unsatisfactory since the joint is in the first place rendered too rigid thereby, and in the second place the bolts or rivets are soon rendered defective by the chemical action of the surround-'.

ing soil and the bands are thus weakened and fail to serve their purpose. Furthermore, if repairs. are necessary at the joint, it is a tedious matter to remove the band in order to obtain access to the joint. As a much more convenient and safe means for locking the joint, I propose to form upon the bell end A of the pi e an inwardly faced abutment to engage a lock interposed between this abutment and a cotiperating abutment on the end of the spigot pipe. In the R. Rus'r, a.

form shown in Figs. 1, 2 and 3, this abutment preferably takes the form of an inwardly turned flange a; between which and therear face of the bearing flange b of the spigot end B of the adjacent pipe a block C, as for example of malleable iron, may be lnserted. In order to insert the block, the

flange a is made of varying diameter, preferably 1n the'form of an ellipse, as shown in Fig. The block C may be inserted at the .pomt of greatest diameter of its flange a (see right hand sideof Fig. 2), and then forced around to the oint of least diameter of the flange is not necessary since the block may be applied after the joint has been completely made and it will then serve merely to prevent the opening of the joint without serving also to forcethe meeting faces of the pipe ends into closer engagement. Where a block of this character isemployed, I pro pose to recess the same as at X so that under a strain so'heavyas' to endanger the pipe,

the wedge itself may buckle slightly, thus 5 permitting the joint to yield somewhat without at the same time allowing it to open. It will be noted also that at the point of greatest diameter of the flan e a there is still aslight bevel which is $11 cient to retain the calkin material usually employed.

Whl e the elliptical form of the abutment flange a, as shown in the drawings, is

my preferred construction, obviously the flange may be given any desired form for 5 this purpose, or the abutment for the block I may be provided in any other suitable way upon the bell mouth, and I do not limit myself to the precise form shown. Nor is it necessary'that the abutment on the spigot flexion of the oint under hydraulic stress, so that the joint is still left free to yield slightly in different planes, under strains due to settlingor varying temperature con- 11 ditions. The joint is readily opened by merely forcing the wedge around to its enusted position the block is prefera- 1 5 bly located only at the point of anticipated trance point and removing it, whereupon the pipe ends are free to be separated.

I claim as my invention 1. A pipe joint comprising a bell end and a spigot end, the bell end having a noncircular inwardly projecting abutment, and the spigot end having a cooperating abutment spaced from the rear face of said inwardly projecting abutment when the joint is made in combination with an independent lock block adapted to be inserted longitudinally into the bell end at the point of greater diameter of said inwardly projecting abut ment and then be forced circumferentially around into engaging position between said cooperating abutments, substantially as described.

2. A pipe joint comprising a bell and a spigot end, the bell end having an elliptical inwardly projecting abutment flange and the spigot end having a cooperative abutment spaced from the rear face of said inwardly projecting abutment when the joint is made in combination with an independent lock block adapted to be inserted longitudinally into the bell end at the point of the long diameter of the elliptical abutment flange and then be forced circumferentially around into engaging position between said scribed.

3. A pipe joint comprising a bell end and a spigot end, the bell end having a non-circular inwardly projecting abutment and the spigot end hav ng ajcooperating abutment spaced from the rear face of said inwardly projecting abutment when the joint is made, in combination with an independent segmental lock block adapted to be inserted longitudinally into the bell end at the point of greater diameter of said inwardly projecting abutment and then be forced circumferentially around into engaging-position between said cooperating abutments to revent the opening of the joint by the long1tn-' dinal separation of the pipe lengths, substantially as described.

Intestimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

ROBERT R; RUST.

Witnesses:

WALTER ABBE, M. E. Knm. 

